From the OpenSSH's ssh_config(5) manpage, the
DynamicForward keyword (and associated command-line switch -D):
Specifies that a TCP port on the local machine be forwarded over the
secure channel, and the application protocol is then used to determine
where to connect to from the remote machine. ... Currently the SOCKS4
and SOCKS5 protocols are supported, and ssh(1) will act as a SOCKS
server.
What can we do with this? ...more